Solar PV panel design and operation

Keep in mind I have no expertise in Solar PV design and operation, was the use of a normally closed contactor at or in the solar PV Panels. It would be installed so that when closed it would short the output of the panels. My understanding is that shorting of the output would not create additional hazards as the maximum fault current is the rated output current at that moment in time (Please advise if there are risks with this option). You would have a switch or circuit breaker at the switchboard supplied by normal network supply and when the switch is on and/or there is network supply the contactor would be open and allow the panels to output to the inverter but when there is no supply the contactor would close preventing output to the inverter.

The reason I thought this may be a better option is that we have seen here the integrity of the IP66 isolator enclosures not being maintained due to the manner in which the cables have been installed and in flood areas this also creates a serious risk when the flood waters retreat. Due to the high arcing potential of DC my concern is that water penetration of the switch will, and has, made a risk of fire due to arcing.

Of course this is all in the future, the key thing is how we respond to fires that are installed now on installations without any of these additional control options.

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